Have a game company. Create a home page. When you are well along in development, open forums. Get the testing of the forums out of the way when nothing "important" is going to be affected by any problems, bugs or other issues. When the time arrives, announce your first project and watch the posts come hard and heavy.
I agree with just about everyone else here. Just because the posts are waning in number doesn't mean interest is any less for this company or what they're doing. It just means interesting topics aren't happening right now and won't until there is something interesting to talk about. Projects will be announced when projects can be announced and then there will be plenty to post, celebrate, berate and complain about.
